An Analytical Method of Organic Chlorine Compounds in Solid Samples

Abstract

Ground water pollution by organic chlorine compounds is noticed recently, and these compounds in wastewater, and solids are suspected to pollute ground water through soil. But, there is not a convenient analytical method of organic chlorine compounds in solid wastes and soil. In this researbh, a method for analysis of total organic chlorine (TOCl) or individual organic chlorine compounds in solid wastes and soil has been developed.
It was found that organic chlorine compounds could be analyzed much more conveniently and accurately by the following procedures and conditions than by the method recommended by Japan Environment Agency: ( 1 ) extract organic chlorine compounds by the addition of 20 ml ethyl acetate and ca.5 ml of water for 10 g solid sample by shaking with ultrasonic wave, ( 2) extract the organic chlorine compounds in the residue by the addition of 20 ml ethyl acetate, ( 3 ) mix the both extracts, ( 4 ) dehydrate the ethyl acetate extract by a small amount of sodium sulfate, ( 5 ) adjust the volume of the ethyl acetate extract to 50 ml, ( 6 ) measure TOC1 and the concentration of individual compounds in the extract by a total organic halogen(TOX) analyzer in the specified conditions and a gas chromatograph (GC)with ECD, respectively.
The per c ent recovery of the organic chlorine compunds were 73 10 2 % for the TOX analyzer, and 85-101 % for the GC-ECD method.